001: package com.protomatter.util;
002:
003: /**
004: * {{{ The Protomatter Software License, Version 1.0
005: * derived from The Apache Software License, Version 1.1
006: *
007: * Copyright (c) 1998-2002 Nate Sammons. All rights reserved.
008: *
009: * Redistribution and use in source and binary forms, with or without
010: * modification, are permitted provided that the following conditions
011: * are met:
012: *
013: * 1. Redistributions of source code must retain the above copyright
014: * notice, this list of conditions and the following disclaimer.
015: *
016: * 2. Redistributions in binary form must reproduce the above copyright
017: * notice, this list of conditions and the following disclaimer in
018: * the documentation and/or other materials provided with the
019: * distribution.
020: *
021: * 3. The end-user documentation included with the redistribution,
022: * if any, must include the following acknowledgment:
023: * "This product includes software developed for the
024: * Protomatter Software Project
025: * (http://protomatter.sourceforge.net/)."
026: * Alternately, this acknowledgment may appear in the software itself,
027: * if and wherever such third-party acknowledgments normally appear.
028: *
029: * 4. The names "Protomatter" and "Protomatter Software Project" must
030: * not be used to endorse or promote products derived from this
031: * software without prior written permission. For written
032: * permission, please contact support@protomatter.com.
033: *
034: * 5. Products derived from this software may not be called "Protomatter",
035: * nor may "Protomatter" appear in their name, without prior written
036: * permission of the Protomatter Software Project
037: * (support@protomatter.com).
038: *
039: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
040: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
041: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
042: * DISCLAIMED. IN NO EVENT SHALL THE PROTOMATTER SOFTWARE PROJECT OR
043: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
044: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
045: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
046: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
047: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
048: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
049: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
050: * SUCH DAMAGE. }}}
051: */
052:
053: import com.protomatter.pool.*;
054: import com.protomatter.syslog.Syslog;
055: import java.util.*;
056:
057: /**
058: * This is the "meat" of the Mutex. It's just
059: * an object pool with 1 object in it.
060: */
061: class MutexObject extends GrowingObjectPool {
062: private boolean initialized = false;
063:
064: public MutexObject() {
065: Hashtable args = new Hashtable();
066: args.put("pool.initialSize", new Integer(0));
067: args.put("pool.maxSize", new Integer(1));
068: init(args);
069: }
070:
071: /**
072: * Initialize the mutex. Don't call this -- it's already called
073: * by the constructor.
074: *
075: * @see com.protomatter.pool.GrowingObjectPool#init
076: * @exception Exception If there is a problem initializing the mutex.
077: */
078: public void init(Hashtable args) {
079: // don't initialize twice
080: if (this .initialized == true)
081: return;
082: this .initialized = true;
083: try {
084: super .init(args);
085: } catch (Exception x) {
086: ; // this can't happen since createObjectPoolObject()
087: // doesn't throw an exception.
088: }
089: }
090:
091: /**
092: * Used internally for growing the pool.
093: *
094: * @exception Exception If there is a problem creating a token.
095: */
096: protected ObjectPoolObject createObjectPoolObject() {
097: return new MutexToken();
098: }
099:
100: /**
101: * Get the synchronization lock object.
102: */
103: public Object getSyncObject() {
104: return super.getSyncObject();
105: }
106: }
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